please help

I am taking a survey and trying to find out information about the students I teach. I ask the following two questions: 1. How many classes are you taking this summer? 2. How long do you expect to take on your first exam? After looking at data on question 2, I determine that there is a 60% chance that a student will finish the exam in less than an hour. Assuming this value is true, and I take a random sample of 20 students, what is the probability that at least 10 but no more than 12 of the students finish the exam in less than an hour? APPENDIX B Tables 877 TABLE Il (continued) ME = 15 -60 463 206 1035 D66 .549 167 1035 1.000 .964 816 398 127 027 1.OOD .995 .944 1648 247 1091 1,000 000 .999 .987 .838 515 .217 .059 1,000 998 939 .722 403 151 1/000 1.000 1.000 304 -1195 2015 1.000 LOUNY L.OUND 950 787 500 213 1.000 1.000 .939 OHS 905 390 131 PIN 1010 100 L.DIN 996 849 597 10 27H 1061 1000 909 1941 11 783 1.000 013 1JO00 1/000 12 1703 1.090 1.000 1.060 13 .973 473 1.0DO 184 1030 1.DO 1.000 .945 1.030 1833 457 1.000 171 100O 1,OOD 1965 517